diff --git a/libpolyml/Makefile.in b/libpolyml/Makefile.in
index 5b6acab0..d8504273 100644
--- a/libpolyml/Makefile.in
+++ b/libpolyml/Makefile.in
@@ -1,1222 +1,1227 @@
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 DIST_SUBDIRS = libffi
 @INTERNAL_LIBFFI_TRUE@SUBDIRS = libffi
 @INTERNAL_LIBFFI_TRUE@libpolyml_la_LIBADD = libffi/libffi_convenience.la
 @ARCHI386_FALSE@@ARCHINTERPRET64_FALSE@@ARCHINTERPRET_FALSE@@ARCHX8632IN64_TRUE@@ARCHX86_64_FALSE@ARCHSOURCE = x86_dep.cpp x86assembly_gas64.S
 @ARCHI386_FALSE@@ARCHINTERPRET64_FALSE@@ARCHINTERPRET_FALSE@@ARCHX86_64_TRUE@ARCHSOURCE = x86_dep.cpp x86assembly_gas64.S
 @ARCHI386_FALSE@@ARCHINTERPRET64_TRUE@@ARCHINTERPRET_FALSE@ARCHSOURCE = interpret.cpp
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 @ARCHI386_TRUE@ARCHSOURCE = x86_dep.cpp x86assembly_gas32.S
 @EXPELF_FALSE@@EXPMACHO_TRUE@@EXPPECOFF_FALSE@EXPORTSOURCE = machoexport.cpp
 @EXPELF_TRUE@@EXPPECOFF_FALSE@EXPORTSOURCE = elfexport.cpp
 
 # Select the object-format-specific modules
 @EXPPECOFF_TRUE@EXPORTSOURCE = pecoffexport.cpp
-@NATIVE_WINDOWS_FALSE@OSSOURCE = basicio.cpp unix_specific.cpp
-@NATIVE_WINDOWS_TRUE@OSSOURCE = winstartup.cpp winbasicio.cpp winguiconsole.cpp windows_specific.cpp
+@NATIVE_WINDOWS_FALSE@OSSOURCE = basicio.cpp unix_specific.cpp osmemunix.cpp
+@NATIVE_WINDOWS_TRUE@OSSOURCE = winstartup.cpp winbasicio.cpp winguiconsole.cpp windows_specific.cpp osmemwin.cpp
 noinst_HEADERS = \
 	arb.h \
 	basicio.h \
 	bitmap.h \
 	check_objects.h \
 	diagnostics.h \
 	elfexport.h \
 	errors.h \
 	exporter.h \
 	gc.h \
 	gctaskfarm.h \
 	globals.h \
     heapsizing.h \
 	int_opcodes.h \
 	io_internal.h \
 	locking.h \
 	machine_dep.h \
 	machoexport.h \
 	memmgr.h \
 	mpoly.h \
 	network.h \
 	noreturn.h \
 	objsize.h \
 	osmem.h \
 	os_specific.h \
 	pecoffexport.h \
 	pexport.h \
 	PolyControl.h \
 	poly_specific.h \
 	polyffi.h \
 	polystring.h \
 	process_env.h \
 	processes.h \
 	profiling.h \
 	realconv.h \
 	reals.h \
 	rts_module.h \
 	rtsentry.h \
 	run_time.h \
 	savestate.h \
 	save_vec.h \
 	scanaddrs.h \
 	sharedata.h \
 	sighandler.h \
 	statistics.h \
 	sys.h \
 	timing.h \
 	version.h \
 	winguiconsole.h \
     winstartup.h \
 	xcall_numbers.h \
 	xwindows.h
 
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     arb.cpp \
     bitmap.cpp \
     check_objects.cpp \
     diagnostics.cpp \
     errors.cpp \
     exporter.cpp \
     gc.cpp \
     gc_check_weak_ref.cpp \
     gc_copy_phase.cpp \
     gc_mark_phase.cpp \
     gc_share_phase.cpp \
     gc_update_phase.cpp \
     gctaskfarm.cpp \
     heapsizing.cpp \
     locking.cpp \
     memmgr.cpp \
     mpoly.cpp \
     network.cpp \
     objsize.cpp \
-    osmem.cpp \
     pexport.cpp \
     poly_specific.cpp \
     polyffi.cpp \
     polystring.cpp \
     process_env.cpp \
     processes.cpp \
     profiling.cpp \
     quick_gc.cpp \
     realconv.cpp \
     reals.cpp \
     rts_module.cpp \
     rtsentry.cpp \
     run_time.cpp \
     save_vec.cpp \
     savestate.cpp \
     scanaddrs.cpp \
     sharedata.cpp \
     sighandler.cpp \
     statistics.cpp \
     timing.cpp \
     xwindows.cpp \
     $(ARCHSOURCE) $(EXPORTSOURCE) $(OSSOURCE)
 
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 pkgconfig_DATA = polyml.pc
 all: all-recursive
 
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 .PRECIOUS: Makefile
 
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/libpolyml/osmemunix.cpp b/libpolyml/osmemunix.cpp
index bdca8c4f..65510697 100644
--- a/libpolyml/osmemunix.cpp
+++ b/libpolyml/osmemunix.cpp
@@ -1,389 +1,397 @@
 /*
     Title:  osomem.cpp - Interface to OS memory management - Unix version
 
     Copyright (c) 2006, 2017-18, 2020 David C.J. Matthews
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License version 2.1 as published by the Free Software Foundation.
     
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
     
     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #else
 #error "No configuration file"
 #endif
 
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif
 
 #ifdef HAVE_ASSERT_H
 #include <assert.h>
 #define ASSERT(x)   assert(x)
 #else
 #define ASSERT(x)
 #endif
 
 #include "osmem.h"
 #include "bitmap.h"
 #include "locking.h"
 
 // Linux prefers MAP_ANONYMOUS to MAP_ANON 
 #ifndef MAP_ANON
 #ifdef MAP_ANONYMOUS
 #define MAP_ANON MAP_ANONYMOUS 
 #endif
 #endif
 
 // Assume that mmap is supported.  If it isn't we can't run.
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
 
 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 
 #include "polystring.h" // For TempCString
 
 // How do we get the page size?
 #ifndef HAVE_GETPAGESIZE
 #ifdef _SC_PAGESIZE
 #define getpagesize() sysconf(_SC_PAGESIZE)
 #else
 // If this fails we're stuck
 #define getpagesize() PAGESIZE
 #endif
 #endif
 
 #ifdef SOLARIS
 #define FIXTYPE (caddr_t)
 #else
 #define FIXTYPE
 #endif
 
 // Open a temporary file, unlink it and return the file descriptor.
 static int openTmpFile(const char* dirName)
 {
     const char* template_subdir = "/mlMapXXXXXX";
     TempString buff((char*)malloc(strlen(dirName) + strlen(template_subdir) + 1));
     if (buff == 0) return -1; // Unable to allocate
     strcpy(buff, dirName);
     strcat(buff, template_subdir);
     int fd = mkstemp(buff);
     if (fd == -1) return -1;
     unlink(buff);
     return fd;
 }
 
+static int createTemporaryFile()
+{
+    char *tmpDir = getenv("TMPDIR");
+    int fd;
+    if (tmpDir != NULL)
+    {
+        fd = openTmpFile(tmpDir);
+        if (fd != -1) return fd;
+    }
+#ifdef P_tmpdir
+    fd = openTmpFile(P_tmpdir);
+    if (fd != -1) return fd;
+#endif
+    fd = openTmpFile("/tmp");
+    if (fd != -1) return fd;
+    fd = openTmpFile("/var/tmp");
+    if (fd != -1) return fd;
+
+    return -1;
+}
+
 #ifdef POLYML32IN64
 OSMem::OSMem()
 {
     memBase = 0;
 }
 
 OSMem::~OSMem()
 {
 }
 
 bool OSMem::Initialise(enum _MemUsage usage, size_t space /* = 0 */, void** pBase /* = 0 */)
 {
     memUsage = usage;
     pageSize = getpagesize();
 
     memBase = (char*)mmap(0, space, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
     if (memBase == 0) return 0;
     // We need the heap to be such that the top 32-bits are non-zero.
     if ((uintptr_t)memBase < ((uintptr_t)1 << 32))
     {
         // Allocate again.
         void* newSpace = mmap(0, space, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
         munmap(FIXTYPE memBase, space); // Free the old area that isn't suitable.
         // Return what we got, or zero if it failed.
         memBase = (char*)newSpace;
     }
 
     if (pBase != 0) *pBase = memBase;
 
     // Create a bitmap with a bit for each page.
     if (!pageMap.Create(space / pageSize))
         return false;
     lastAllocated = space / pageSize; // Beyond the last page in the area
     // Set the last bit in the area so that we don't use it.
     // This is effectively a work-around for a problem with the heap.
     // If we have a zero-sized cell at the end of the memory its address is
     // going to be zero.  This causes problems with forwarding pointers.
     // There may be better ways of doing this.
     pageMap.SetBit(space / pageSize - 1);
     return true;
 }
 
 void* OSMem::AllocateDataArea(size_t& space)
 {
     char* baseAddr;
     {
         PLocker l(&bitmapLock);
         uintptr_t pages = (space + pageSize - 1) / pageSize;
         // Round up to an integral number of pages.
         space = pages * pageSize;
         // Find some space
         while (pageMap.TestBit(lastAllocated - 1)) // Skip the wholly allocated area.
             lastAllocated--;
         uintptr_t free = pageMap.FindFree(0, lastAllocated, pages);
         if (free == lastAllocated)
             return 0; // Can't find the space.
         pageMap.SetBits(free, pages);
         // TODO: Do we need to zero this?  It may have previously been set.
         baseAddr = memBase + free * pageSize;
     }
     int prot = PROT_READ | PROT_WRITE;
-    if (allowExecute) prot |= PROT_EXEC;
     if (mmap(baseAddr, space, prot, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == MAP_FAILED)
         return 0;
     msync(baseAddr, space, MS_SYNC | MS_INVALIDATE);
     return baseAddr;
 }
 
 bool OSMem::FreeDataArea(void* p, size_t space)
 {
     char* addr = (char*)p;
     uintptr_t offset = (addr - memBase) / pageSize;
     // Remap the pages as new entries.  This should remove the old versions.
     if (mmap(p, space, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == MAP_FAILED)
         return false;
     msync(p, space, MS_SYNC | MS_INVALIDATE);
     uintptr_t pages = space / pageSize;
     {
         PLocker l(&bitmapLock);
         pageMap.ClearBits(offset, pages);
         if (offset + pages > lastAllocated) // We allocate from the top down.
             lastAllocated = offset + pages;
     }
     return true;
 }
 
 void* OSMem::AllocateCodeArea(size_t& space, void*& shadowArea)
 {
     char* baseAddr;
     {
         PLocker l(&bitmapLock);
         uintptr_t pages = (space + pageSize - 1) / pageSize;
         // Round up to an integral number of pages.
         space = pages * pageSize;
         // Find some space
         while (pageMap.TestBit(lastAllocated - 1)) // Skip the wholly allocated area.
             lastAllocated--;
         uintptr_t free = pageMap.FindFree(0, lastAllocated, pages);
         if (free == lastAllocated)
             return 0; // Can't find the space.
         pageMap.SetBits(free, pages);
         // TODO: Do we need to zero this?  It may have previously been set.
         baseAddr = memBase + free * pageSize;
     }
 
     int prot = PROT_READ | PROT_WRITE;
     if (memUsage == UsageExecutableCode) prot |= PROT_EXEC;
     if (mmap(baseAddr, space, prot, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == MAP_FAILED)
         return 0;
     msync(baseAddr, space, MS_SYNC | MS_INVALIDATE);
     shadowArea = baseAddr;
     return baseAddr;
 }
 
 bool OSMem::FreeCodeArea(void* codeAddr, void* dataAddr, size_t space)
 {
     ASSERT(codeAddr == dataAddr);
     char* addr = (char*)codeAddr;
     uintptr_t offset = (addr - memBase) / pageSize;
     mmap(codeAddr, space, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0);
     msync(codeAddr, space, MS_SYNC | MS_INVALIDATE);
     uintptr_t pages = space / pageSize;
     {
         PLocker l(&bitmapLock);
         pageMap.ClearBits(offset, pages);
         if (offset + pages > lastAllocated) // We allocate from the top down.
             lastAllocated = offset + pages;
     }
     return true;
 }
 
 bool OSMem::EnableWrite(bool enable, void* p, size_t space)
 {
     int res = mprotect(FIXTYPE p, space, enable ? PROT_READ|PROT_WRITE: PROT_READ);
     return res != -1;
 }
 
 bool OSMem::DisableWriteForCode(void* codeAddr, void* dataAddr, size_t space)
 {
     int prot = PROT_READ;
-    if (needExecute) prot |= PROT_EXEC;
+    if (memUsage == UsageExecutableCode) prot |= PROT_EXEC;
     int res = mprotect(FIXTYPE codeAddr, space, prot);
     return res != -1;
 }
 
 #else
 
 // Native address versions
 
 OSMem::OSMem()
 {
     allocPtr = 0;
     shadowFd = -1;
 }
 
-OSMem::OSMem()
+OSMem::~OSMem()
 {
     if (shadowFd != -1) close(shadowFd);
 }
 
 bool OSMem::Initialise(enum _MemUsage usage, size_t space /* = 0 */, void **pBase /* = 0 */)
 {
     memUsage = usage;
     pageSize = getpagesize();
     if (usage != UsageExecutableCode) return true;
     // Can we allocate memory with write+execute?
     int fd = -1; // This value is required by FreeBSD.  Linux doesn't care
     void *test = mmap(0, pageSize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, fd, 0);
     if (test != MAP_FAILED)
     {
         // Don't require shadow area
         munmap(FIXTYPE test, pageSize);
         return true;
     }
     if (errno != ENOTSUP && errno != EACCES) // Fails with ENOTSUPP on OpenBSD and EACCES in SELinux.
         return false;
     // Check that read-write works.
     test = mmap(0, pageSize, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, fd, 0);
     if (test == MAP_FAILED)
         return false; // There's a problem.
     munmap(FIXTYPE test, pageSize);
     // Need to create a file descriptor for mapping.
-    char *tmpDir = getenv("TMPDIR");
-    if (tmpDir != NULL)
-    {
-        shadowFd = openTmpFile(tmpDir);
-        if (shadowFd != -1) return true;
-    }
-#ifdef P_tmpdir
-    shadowFd = openTmpFile(P_tmpdir);
-    if (shadowFd != -1) return true;
-#endif
-    shadowFd = openTmpFile("/tmp");
-    if (shadowFd != -1) return true;
-    shadowFd = openTmpFile("/var/tmp");
+    shadowFd = createTemporaryFile();
     if (shadowFd != -1) return true;
     return false;
 }
 
 // Allocate space and return a pointer to it.  The size is the minimum
 // size requested and it is updated with the actual space allocated.
 // Returns NULL if it cannot allocate the space.
 void *OSMem::AllocateDataArea(size_t &space)
 {
     // Round up to an integral number of pages.
     space = (space + pageSize-1) & ~(pageSize-1);
     int fd = -1; // This value is required by FreeBSD.  Linux doesn't care
     int flags = MAP_PRIVATE | MAP_ANON;
 #ifdef MAP_STACK
     if (memUsage == UsageStack) flags |= MAP_STACK; // OpenBSD seems to require this
 #endif
     void *result = mmap(0, space, PROT_READ|PROT_WRITE, flags, fd, 0);
     // Convert MAP_FAILED (-1) into NULL
     if (result == MAP_FAILED)
         return 0;
     return result;
 }
 
 // Release the space previously allocated.  This must free the whole of
 // the segment.  The space must be the size actually allocated.
 bool OSMem::FreeDataArea(void *p, size_t space)
 {
     return munmap(FIXTYPE p, space) == 0;
 }
 
 bool OSMem::EnableWrite(bool enable, void* p, size_t space)
 {
     int res = mprotect(FIXTYPE p, space, enable ? PROT_READ|PROT_WRITE: PROT_READ);
     return res != -1;
 }
 
 void *OSMem::AllocateCodeArea(size_t &space, void*& shadowArea)
 {
     // Round up to an integral number of pages.
     space = (space + pageSize-1) & ~(pageSize-1);
 
     if (shadowFd == -1)
     {
         int fd = -1; // This value is required by FreeBSD.  Linux doesn't care
         int prot = PROT_READ | PROT_WRITE;
         if (memUsage == UsageExecutableCode) prot |= PROT_EXEC;
         void *result = mmap(0, space, prot, MAP_PRIVATE|MAP_ANON, fd, 0);
         // Convert MAP_FAILED (-1) into NULL
         if (result == MAP_FAILED)
             return 0;
         shadowArea = result;
         return result;
     }
 
     // Have to use dual areas.
     size_t allocAt;
     {
         PLocker lock(&allocLock);
         allocAt = allocPtr;
         allocPtr += space;
     }
     if (ftruncate(shadowFd, allocAt + space) == -1)
         return 0;
     void *readExec = mmap(0, space, PROT_READ|PROT_EXEC, MAP_SHARED, shadowFd, allocAt);
     if (readExec == MAP_FAILED)
         return 0;
     void *readWrite = mmap(0, space, PROT_READ|PROT_WRITE, MAP_SHARED, shadowFd, allocAt);
     if (readWrite == MAP_FAILED)
     {
         munmap(FIXTYPE readExec, space);
         return 0;
     }
     shadowArea = readWrite;
     return readExec;
 }
 
 bool OSMem::FreeCodeArea(void *codeArea, void *dataArea, size_t space)
 {
     bool freeCode = munmap(FIXTYPE codeArea, space) == 0;
     if (codeArea == dataArea) return freeCode;
     return (munmap(FIXTYPE dataArea, space) == 0) & freeCode;
 }
 
 bool OSMem::DisableWriteForCode(void* codeAddr, void* dataAddr, size_t space)
 {
     int prot = PROT_READ;
     if (memUsage == UsageExecutableCode) prot |= PROT_EXEC;
     int res = mprotect(FIXTYPE codeAddr, space, prot);
     return res != -1;
 }
 
 #endif